I'm currently evaluating Fusion (coming from Nuke) and ran into a strange issue with particles. I found one post regarding this from about a year agoviewtopic.php?f=22&t=47690and was wondering if this issue has been addressed in the meantime and I just don't know how to set this up right.

The issue is this:

When using the bitmap style of the particle emitter (in 3D mode) the transparency of overlapping particles is calculated wrong when using the software renderer. When using the OpenGL renderer everything is fine but to ensure consistency across different machines I would prefer the software renderer.

Interestingly enough this is only true for particles. If I replicate a few image planes and stack them up much like what the emitter produced - and let them use the exact same image (texture) - also the software renderer produces the correct result.

I've attached an image and a sample composition showing the issue. You can switch the renderer between OpenGL and software to see the difference. With the software renderer some of the circles have the wrong brightness and some show a strange outline in the overlapping areas.